I started doing lunges around a track in my neighborhood. But instead of my back leg bending, I would keep it straight and lunge a little farther, get a little lower, and when I would take my step forward, I would make sure I got into a tip-toe position for a second or two before lunging to my other leg. It's work out my calves as well.
Today, my glutes are SORE SORE SORE...not so much my quads. Actually, my quads aren't sore at all. However, during the exercise, my legs felt jello-y and my quads were on FIRE. I was only able to get about 1/4 of the way around the track doing lunges this way before I turned around, and I cycle fairly frequently.
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